Magnetization of erbium in the ordered and paramagnetic phases

We present measurements of Er magnetization in the paramagnetic and ordered phases. Our values agree with those already published by other authors, but a small anomaly in the basal-plane magnetization was also noted in the conical phase. By extension of the theoretical model of Jensen, it was possible to reproduce the characteristics of the paramagnetic and sinusoidal arrangements with a single set of parameters. Another set of parameters was necessary to describe the conical and low-temperature antiferromagnetic phases. The model provides a possible explanation for the experimental anomaly in the conical phase, and suggests a different arrangement of spins for the low-temperature antiferromagnetic phase.